Quick-change punch and holder therefor



JNov. .25,- 1930. v F.- sHERlDAN 14,7853028 QUICK CHANGE PUNCH ANDHOLDER THEREFOR Filed May 31, 1925 l l, INVETNOR'.

7 /0 Cquucr. F. HLRRIQI'.

Patented Nov.` 1930 UNITED STATES YPAfri-:NT OFFICE g i if l CLARENCE F.sHnnrDAN, or nn'rnorr, MICHIGAN QUICK-.CHANGE rUNcH `.AND nomma'rnnnnron A application meanay 31, 192s. serial N.e1,7o3.

My invention relates `to a new and useful improvement in a'quick changepunch and l holder therefor, and has for itsobject the provision of apunch which may be easily and 5 quickly removed from and replaced inthepunchholder l Another ob] ect of the invention is the provision of ameans for retaining the punch which Willpermit easyand quick changing, mand which may be economically manufactured, and which will be durableand efficient in use. v Other objects will appear hereinafter.` Y Theinvention consists in the combination 15 and arrangement of partsvhereinafter described and claimed. f

The invention will be best understood by a reference to the accompanyingdrawings which form a part of this specification and-in 2 which, l

y Fig. 1 is a side elevational view of the in`` i vention with partsbroken `away and partsv shown in section.

. Fig. 3 is an enlarged view similar to Fig. 2, with the punch slightlyturned.

The punch 7 is provided with a diametrical-k ly extending socket 8adjacent its upper end and positioned in the socket 8 is acoil spring 9,engaging at one end the face of the socket andv at the other end, alocking pin 10 `which has a reduced stem 11 eXtending'inwardly of thespring 9. The punch holder 12 ispro- `vided with a `recess 13Vc0mmunicating with the bore14 into which the punch 7 is adapted to t.This holder is secured by suitable screws 15 to a backing plate 16.

In use the punch 7 is inserted intothe bore" 14 and in order toaccomplish this the locking pin 10 is thrust inwardly of the socketV 8.

When the punch 7 is thrust inwardly so as n to engage the backing plate16 a rotation of the punch V7 will .bring 'the locking pin10 intoalignment with the recess 13, at which time the spring 9 will force thelockingA pin outwardly so as to engage in therecess 'i3 as shown inFigs. 1 and 2. By forming this recess 13 on the upper portion of thepunch holder 12, the pin 10 serves to retain the punch inthe holder 12.One of the side walls" 17 of the recess is formed tangent tothe ,bore-14. Should' the punch '7 become broken,

damaged, or should it be desired for other reasons to 'remove the punch7 from the holder 55 12, it vwould bebut necessary to rotatethe punch 7so as to bring the end of thelock ing'pin 10 into engagement with thetangential surface 17. A further rotation would effect an inwardthrusting of the locking pin 10 until its outer end would lie flush withthe periphery'oi' the punch 7 at4 which time theV punch 7 could be movedaxially outofthe` In this way the mounting the punchin 65 n y Y thescope of the appended claim. Fig. 2 is a view taken on line 2-2 ofFig. 1. s

`a radially movable ylocking member on said` punch engageable in saidrecess for locking said punch against removal from said holder; andresilient means for normally thrusting` said radially movable lockingmember outwardly `beyond the periphery of said punch,

into said recess, the rotation ofsaid1 punch in said holder, effecting,through engagement of said locking member with said tangent side l wall,an inward movement of,` saidlocking member to inoperative position. In`testimony whereof I `have signed the foregoing specification. .l Y .n

` `CLARENCEYF.-.SHERIDAN.

